Reduction-mill.



Patented May 30,1916.

I 2 SHEETS-SHEET I.

` UEM 0. C. BEACH.

REDUCTION MILL.

APPLICATION FILED MAY 4.1914. www@ LLLEI J M..

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WW N M INI/ENTOR-v 0' C' BEHCH 2SHEET$ SHEET2I /iu ATTORNEYS.

0. C. BEACH.

REDUCTIONYWIILL.

APPLlcATloN H11-'.11 MAY 4. 1914.

VIM. M

' provide a reduction mill in which there is no .j EN patrias parleur nntp@N @SCAR C. BEACH, 0F LOS ANGELES. CALIFORNIA, ASSllGNOR; T0 FREDERICK W. BRAUN, @1E` LOS ANGELES, CALIFORNIA.

REDUCTONMILL Lilddlldti.

Specification of Letters Patent.

Patented lll/lay 3d, :wld

Application led May l, 191A. Aerial 1Mo. 836,099.

To all whom it may concern.'

Be it known that ll, @SCAR C. BEACH, a citizen of the United States, and a resident of the city of Los Angeles, county of Los Angeles, and State of California, have invented certain new and useful llmprovements in Reduction-Mills, of which the following is a specification.

'llhe invention relates to reduction mills or ore grinding mills, and particularly to relatively small capacity mills.

@ne of the objects of the invention is to provide a practical small capacity reduction mill for the grinding of ore.

Another object of the invention is to provide a reduction mill which may be readily adjusted to compensate for wear or to vary the degree of ineness to which the ore is ground.

Another object of the invention is to provide a reduction mill in which the various parts are readily accessible and removable.

A further object of the invention is to in full that form of the 'invention which l have selected for illustration in the drawings accompanying and forming part of the specification, and although in such drawings l have shown only one specific form of my generic invention it is to be understood that l do not limit myself to such forni because my invention may be embodied 1n. a multiplicity of forms, each being a species of my said invention. It is also understood that by the claims succeeding the description of my invention, ll desire to cover .the invention in whatever form it may be embodied. l

Referring to said drawings: lgure 1 1s a vertical section of the reduction mill of 'my invention. Fig. 2 is a plan view of the section ofthe upper grinding disk taken on the line A-A Fig. 2. Fig. 4: is a plan view of the lower grinding disk. Fig. 5 is a vertical section of the lower grinding disk taken on the line B-B llig. A.

The reduction mill of my invention is designed particularly for small capacity work to enable the working of ore bodies on a small scale and at a relatively. low price for equipment and also may be used in lahoratories for grinding samples of ore. 'lthe apparatus comprises a body portion or shell which is formed in two parts 2-3 which are removably held together by bolts A, passing through lugs formed on the outside of the parts. 'llhe lower portion 2 is provided with an upstanding annular flange 5 within which the upper portion 3 of the shell seats, so that a tight joint may be formed between the parts. 'lhe lower portion of the shell is provided with legs 6 of suitable length, so that the driving mechanism may be arranged therebetween. r.'lhe bottom Z of the lower portion is inclined toward the discharge outlet 8 which is arranged at the opposite side of the mill from the drive shaft 9. Arranged in a central aperture in the bottom 7 is a bearing 12 for the vertical shaft 13, secured to the uper end of which shaft is the fly wheel 14:.

he bearing 12 is provided with an up wardly extending portion which engages in the hollow hub 15 of the dy wheel, the depending annular wall of the hub serving to prevent the ground ore from coming into contact with the bushing 20. Splned on the shaft 13 below the bearing 12 is a bevel gear 16 which is engaged. by the bevel gear 17 on the driving shaft 9. 'lhe driving 'shaft 9 is supported in the bearing 18 formed on the bracket 19, and in 1an'outboard bearing (not shown) formed on the outer end of the bracket.v 'llhe bevel gear 16 is held between Athe hearing 12 *and the bushing 21 of bearing 22 and is separated therefrom b ber washers 23. 'llhe bushing 21 projects elow the bearing 22and is provided at such projecting portion with a screw thread which is engaged by a cap `24: in which is arranged a step bearing 30 for the fiber washers prevent. dust and dirt vfrom coming in contact with the lower bearings, a feature which is essential in a successful reduction mill.

l Removably secured to the fly wheel 14 is a the lower or rotating horizontal grinding disk 28 which seatsin an indentation in the fly wheel and which is provided with lugs 29 which seat in apertures of larger area in the ily-wheel. The grinding disk 28 is provided at the lower portion of its outer side -with a plurality of pockets 37 having back- `wardly inclined rear faces, which are engaged by screws 31 arranged in ears on the iy-wheel. These screws other than serving to clamp the disk 28 to the flywheel, are em ployed to adjust the position of the disk on the iiy-wheel in order to compensate for any veccentricity of weight of the disk or ily-wheel. The screws 31 are provided with lock-nuts 31L for locking them in the set positions. l

f Secured to the upper portion 3 of the shell by means of bolts 32 and lugs 33, is a stationary horizontal grinding disk 34 which is 'provided with a central aperture which registers with an aperture 35 in the topv of shell 3. The lugs and bolts engage in apertures of larger area in the shell, so that the position of the disk 34 maybe adjusted, so that it may be eccentric or concentric with relation to disk 28. Arranged above the shell and secured thereto is a hopper 36, the outlet of which registers'with the aperture 35 in the shell. The faces of the grinding disks are in contact or lie closetogether and the distance between them may be varied or their wear may'be compensated by rotating the cap 24 in which the step bearing for the vertical shaft is arranged. By adjusting the position of the lower grinding disk with respect to the upper, different degrees of fineness of the ore may be obtained, a feature which is of great importance in ore testing work. The disks are, therefore, ad justable vertically or laterally with respect to each other.

ing face of each disk comprises a succession of alternate radially disposed pockets 38 and elevations 39,v both pockets and elevations increasing in width outwardly. The elevations and depressions terminate within the of substantially 90, merging at one end into the aperture 35 and at the other end into the peripheral face 41. The rotating disk is more shallow than the stationary disk and the depressions therein terminate adjacent the center of the disk, providing at the central portion an elevation 42 from which l the elevations 39 spring. The faces of the elevations on the twd disks approach each other as they progress outwardly until they virtually meet at the grinding surfaces 41.

The centrifugal action caused by the rapid rotation of the lower disk forces the ore outward and it is caught between the eleva-` tions on the disks and broken and ground into smaller particles. l The articles as they are broken moveoutwar still further broken and finally move into the space between the edges of the disks, where they are ground to the desired fineness. Discharging from the disks, the ground ore falls onto the inclined bottom 7, whence it may be washed through the discharge outlet 8 by means of water entering throughthe pipe 43. All of the ore i'ntroduced between the disks is forced outwardly and ground, and the centrifugal force of rotation forces it outward between the disks and increases the rate at which it is ground.

I claim:

1. In a reduction mill, a stationary horizontal grinding disk, a vertical shaft, a fly wheel attached ,to the upper end of said shaft, a rotatable horizontal grindingl disk adjustably mounted on said fly wheel and means for adjusting said rotatable disk erlically with respect to the stationary 2. In a reduction mill, a vertical shaft, a

shaft a grinding disk mounted on said iiywhee, means for adjusting said disk laterally with respect to said fly-wheel and for clamping itin the adjustable position, a stationary horizont-al disk arranged above and associated with said adjustable disk, and means for adjusting said first named disk vertically.

3. In a reduction mill, a shell, a vertical shaft extending into said shell, a fly wheel attached to the upper end of said shaft, a grinding disk adjustably secured to said Hy Wheel, a stationary horizontal grinding disk arranged above and associated with said first named grinding disk and means for adjustably securing disk to said shell.

said stationary grinding y and are menor@ A 4c. ln a. reduction mill, a shell having an ln testimony whereof, l have hereunto set inclined bottom Wall, a vertical shaft exmy hand et Los Angeles, California., this l: tending thdroillglfit said Wrlll, meaned Jfor dL-I 25th day of April 1914. justing sai s a. Vertice y, a grin ing 's 5 adjustably secured to the upper end of said @SCAR C BEACH shaft and a stationery grinding disk secured iin presence ofto said shell arranged above and in coperar- H. D. oKrNNoN, tive relation with said rst mentioned disk. WM. KENNEDY. 

